ajax2—solve cache problems—php (28), ajax2 cache_PHP tutorial

ajax2—solve caching problem—php (28), ajax2 cache

5. ajax quick start

ajax code:

Php program:

Php code:

ajax calculates the sum of two numbers

7. Solving cache problems

Questions above:

Change addition in php to subtraction

If the previous request parameter is used, it is still found to be addition. If it is a new request parameter, it is subtraction.

Solution 1: Random number

Math.random();

Solution 3. Set request header

setRequestHeader("If-Modified-Since","0");

Solution4. Set response header

header("Cache-Control: no-cache, must-revalidate");

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